Bob Jennings 1 Posted August 13, 2019 Author Share Posted August 13, 2019 Cheers Andy. I'll be buying pins and glues at Barkston... as well as a beer or two. Quote Link to comment Share on other sites More sharing options...
dirk tinck Posted August 15, 2019 Share Posted August 15, 2019 Nice going there Bob,follwing... Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted September 3, 2019 Author Share Posted September 3, 2019 Tail end halves coming together. Squaring up the formers and fixing in place. Checking it's all true, up and down. Fin core is polystyrene. Spruce stringer in place. I decided to cut the stringer notches after laying the stringer in place and marking before using a square file to create the notch inside the pen lines. The formers are thick enough to butt up adjacent panels. A bit of relieving is usually needed to get a nice tidy fit. Back end space for the tailplane assembly. Closing up the bottom section to add some stiffness. Now... I had an utter mare with the nose section and to make it right required some surgery to my beautiful planking. Lesson learnt and I need to re-draw the formers on my plan at some point. It was emotional taking a saw to it. But I'm glad I did. Meanwhile, the wings arrived! Happy day. Just need the centre section building now. All the flappy bits in the wing need making up plus the nacelles and tippy bits. The tailplane needs jigging and fairing into the back end. Lots still to do. Wings are a good size. Getting down to business with the twin bowden cable outers for the elevator. I used some of the lightening holes to support the cable runs. Once they had been thinned down. The MAD boom sorted. Balsa formers and solid blue foam wrapped with brown paper and PVA. Incredibly light. I thought spiral wrapping the paper might add some structural integrity. As if it needed it! The tailplane needs to have a secure fixing so I'm fashioning these stress plate sandwiches to enclose the tubes to allow the tailplane halves to slide on. It will make sense later. The idea is to set the dihedral and incidence with these plates in the fuselage. A bit of tail fin detail. Fin skins, chamfered at the trailing edge to allow a shrouded rudder housing. Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted September 3, 2019 Author Share Posted September 3, 2019 Fin skins, chamfered at the trailing edge to allow a shrouded rudder housing. All glued up and clamped. Progress shot. And the rudder. Trying a balsa and 1/32' ply structure. It won't need glassing just primer and paint. Not sure if I'll save any weight, but you have to try these things. It will be stiff though. Making sure to take photos sometimes slips my mind, there's so much to do but I'll keep shooting the key bits. Thats it for now. Quote Link to comment Share on other sites More sharing options...
Alan Gorham_ Posted September 3, 2019 Share Posted September 3, 2019 Very interesting to see Bob! I'd be tempted to slap a coat of epoxy resin on the rudder skins before painting though. Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted September 3, 2019 Author Share Posted September 3, 2019 I was thinking of using a spirit based sanding sealer just to seal and fill the grain. Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted September 3, 2019 Share Posted September 3, 2019 Crikey Bob, mega upload! Good work. I usually use a sanding sealer for that job too, or even paint on a bit of WBPU. Quote Link to comment Share on other sites More sharing options...
Alan Gorham_ Posted September 3, 2019 Share Posted September 3, 2019 WBPU? Devil's snot more like! The reason I suggested epoxy is that it'll give you a primeable finish with one thin coat unlike sanding sealer or WBPU and it won't warp. I did assume you'd be glassing the rest of the model though so you would have some to hand? Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted September 3, 2019 Author Share Posted September 3, 2019 Yes, I got on a roll and just remembered to keep taking some photos when I got to the end of a session or a key bit. WBPU sprung to mind too and I guess a thin epoxy would also work well. Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted September 3, 2019 Author Share Posted September 3, 2019 Devil's snot... yep, I can see that. Yep, a thin layer of epoxy may win out when I'm glassing the rest. Edited By Bob Jennings 1 on 03/09/2019 15:24:47 Quote Link to comment Share on other sites More sharing options...
Alan Gorham_ Posted September 3, 2019 Share Posted September 3, 2019 I do use sanding sealer made from celly dope and talc when I'm building a model I'm covering with tissue so I'm not totally against it, I just find it takes a few coats to really seal the grain and even on a close grained thin ply, I still think epoxy will do it all in one coat and smell less. I don't find WBPU a very good grain filler. I've seen people use 6 or 7 coats just because it dries quickly but I am not a fan Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted September 3, 2019 Share Posted September 3, 2019 I use exactly the same talc trick with WBPU. Done in one coat, but each to there own. Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted October 22, 2019 Author Share Posted October 22, 2019 Okay, where were we? Oh yes, finishing off the season on top of the Great Orme! What a brilliant day. Very busy! The 'rod has cracked on apace. I had the rather tricky task of how to fit the tailplanes in a fashion that was detachable... the principle is easy to imagine. Transferring the loads to the rest of the airframe caused some head sctatching. The tail planes are at a 6 degree dihedral each side and at a negative incidence of 1 degree. This was set without the tailplane on the fuselage by angling some stress plates with some insert jigs at the correct dihedral and raising the aft jig by 1 degree to the datum. The design of the stress plates, mounted in the correct orientations allows the tailplanes to simply slide on! Measuring the torque rods for the elevators, driven by dual Bowden cables, will allow me to close up the rear fuselage ready for glass. Then it's a case of attaching the linkages and fairing over this rear section with the detachable tail boom. A bit out of sequence, this is how I glued the tailplane tips with gorilla glue... ... with holes in a ply plate to let the glue flow through to the balsa. This was shaped to section once it cured Centre section next! Quote Link to comment Share on other sites More sharing options...
Andy Meade Posted October 22, 2019 Share Posted October 22, 2019 Looking great Bob, she'll soon be done. Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted October 22, 2019 Author Share Posted October 22, 2019 With quite a few formers in the centre section and the alignment of the nose mounting tubes to consider, I did a dry fit of the central core structure that everything hangs off. Phenolic wing spar tube is 38mm diameter. Happy that everything was pretty darned square, the glue and angle section balsa tied it all together. Creative use of clamps squares and elastic bands kept everything straight at the front end. Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted October 22, 2019 Author Share Posted October 22, 2019 She's now starting to fill the shed! I'll get some more work done on the centre structure to a point where I'm happy to leave her so I can get the Mass build Sabre done before Christmas! Yeah, right.... 1 Quote Link to comment Share on other sites More sharing options...
Martin Gay Posted October 22, 2019 Share Posted October 22, 2019 Bob, If you build the Sabre at the same speed as the Nimrod you will have it ready for covering by the end of next month! Martin. Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted July 27, 2022 Author Share Posted July 27, 2022 (edited) Well, it's been a long time since the last post and there has been some development! Here's a photo update. Wings were cut by Phil at Cloud Models. And a grand job he did too. Filling in the space for the wing root adjacent to the flaps Wings are taking shape here with the huge built up surfaces all with recessed Robart hinges Starboard side root Positioning the nacelles and exhaust pipes Intakes starting to take shape Using up some old packing foam Helping the shape and firming up the foam with some Polyfilla Onefill. Agricultural means of ensuring a good Gorilla glue bond! Back to the main fus Making up the fuselage wing for fairing Overall fuselage taking up a lot of space in the shed! Large builds seem to require a lot of holding devices. This is about a quarter of my clampage stock! Edited July 27, 2022 by Bob Jennings 1 Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted July 27, 2022 Author Share Posted July 27, 2022 I think I overloaded this thread with photos... Nacelles dried and sanded Blending in the wing root fairing Blanked intake discs from rough beginnings Taking shape Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted July 27, 2022 Author Share Posted July 27, 2022 Sorting the flappage Floodlights in place Floodlight cover pinned and glued Playing around with colour and shading Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted July 27, 2022 Author Share Posted July 27, 2022 Smoothing out the brown paper covered foam and blanked off intakes Getting a droop on! Here's a big gap in photos and a leap in construction Almost there Rigged and ready Same scale C-17 3 Quote Link to comment Share on other sites More sharing options...
Bob Jennings 1 Posted July 27, 2022 Author Share Posted July 27, 2022 12 Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted July 27, 2022 Share Posted July 27, 2022 VERY impressive! Quote Link to comment Share on other sites More sharing options...
Dickw Posted July 27, 2022 Share Posted July 27, 2022 Oh, that is really nice 👍 Dick Quote Link to comment Share on other sites More sharing options...
Trevor Posted July 27, 2022 Share Posted July 27, 2022 Excellent 👍 Quote Link to comment Share on other sites More sharing options...
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